I know both MrHP and 222 were at the Clash of the Titans last weekend.

They are probably just busy taking care of business.

 

Thanks Hedsup I did get E-mail that told me that same thing but I cant get a call to order "SOME" cant go faster without that call.[img]i/expressions/face-icon-small-sad.gif[/img]

 

I know the feeling![img]i/expressions/face-icon-small-frown.gif[/img]

 

Most of the out of round cylinders have been TVI 720's. Those were steel sleeves that expanded and contracted at different rates than the rest of the cylinder..........which caused more movement in the sleeve that led to erradic head gasket surface area and sealing ability.

The cause of the cylinder going out of round is due to the fact that the top of the cylinder isn't braced. The OEM cylinder is not braced either but it gets away with it due to cylinder wall thickness. After you over bore the OEM cylinder to have room for a 105mm piston and the thickness of the steel sleeve, you have a very thin section of original cylinder wall left for the steel sleeve to be mated to. Now think about what happens when the steel sleeve by being composed of a different material is independent of this thin cylinder wall section but is relying on it to keep everything in place. It is less than ideal. The aluminum sleeve will work but ideally you want to brace the top of the cylinder to the outer casting all the way around. If you take two thin sections, sandwich them together and apply heat they will conduct heat at a different rate than a solid section equalling the combined thickness of the other two. That changes everything and should be taken into consideration.

I have never heard of an "HPR" 730 going out of round. The only way that would be physically possible is due to severe overheating or it came that way as a casting flaw. The reason is the HPR 730 cylinder is fully braced to the outer casting.

Headsup did not say it was an HPR 730 that he heard was out of round. If he mean't that, i would be interested to hear who it was and how this came about.

I think you are wise to buy a Renegade for the type of riding you do. I wish I could justify having one in my garage! [img]i/expressions/face-icon-small-smile.gif[/img]

 

we will have to ask scott who it was.

 

It WAS a Horsepower Research 730 cylinder.

I was quite surprised.

It could have been a flaw in the manufacturing process.

 

Who's was it and what do you think caused it?

 

Is there a replacement policy for a flawed cylinder ?

 

Calistud/Rcoop - Something really catastrophic had to happen for a fully braced cylinder to go out of round. The whole outer casting has to be warped or the braces are cracked. There is no physical way for the cylinder to change shape without separating from the outer casting.

Cheetah makes the cylinders to HPR's specs. Has anyone contacted them?

This seems fishy. It hink this is either a game by the usual HPR haters or someone severely over heated a motor. They use the same mold for all the cylinders. How could one come out of manufacturing warped when the rest are fine?

Doesn't add up....

 

Nut I gotta ask? and Im not starting or picking on you, but why is it every time HPR questions come up you answer and not Randall or Eric?